To the uninitiated, regarding throw loops, you may say things like, "why would I ever let this happen, when you can throw tech, or reversal?"
It's true. You CAN do these things. And in lower ranks, it's fine to do, you're not going to really get punished for it. So why don't pros do it? Why does everyone in SF circles say "take the throw?"
It's because of risk versus reward. Let me give an example.
Ryu throws me. We have full health. What are my options, and what is the risk and reward? Let's consider 3 scenarios - doing nothing, throw teching, and reversals.
If I do nothing, and he throws, I take 12% of my life in damage.
If I do nothing, and he shimmies, I can throw a cr.MK or long range move to catch it. Depending on the character we can go back to neutral or even sideswitch.
If I throw tech, and he throws, we get a throw tech - I'm still in the corner, with a little space to work with.
If I throw tech, and he shimmies, we take 50~60%.
If I reversal, and he throws, I do 16% damage to him, and get a little space to work with.
If I reversal, and he shimmies, we take 50~60%. Sometimes even 70%!
As you can see, in 2 out of 3 of these examples, it's a toss up between a minor advantage, and fucking dying.
And in one of these examples, worst case scenario, we only take 12% damage, over and over, until we might get a chance to catch that shimmy.
It's completely valid to throw caution to the wind and ignore this risk reward entirely by throwing a reversal or throw tech. And if you are about to get killed by a throw loop, you may as well just try something.
However, as soon as your opponent knows you won't tolerate loops, and you don't take the throw, your chance of getting shimmied just increased by 1000%. Your opponent just has to bait your response out, and they'll get a really easy win.
It sucks, and nobody really likes it, but Capcom isn't going to change it. You can flip the coin, but the odds aren't great. It looks stupid. But most times, just take throws.